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Content source: ICAO ICAO


LOC-I: Loss of control - inflight - Loss of aircraft control while or deviation from intended flightpath inflight.

Loss of control inflight is an extreme manifestation of a deviation from intended flightpath. The phrase “loss of control” may cover only some of the cases during which an unintended deviation occurred. It is therefore suggested that the occurrence title is reviewed and changed accordingly. For example: Deviation from Intended Flightpath- DEV.

Usage Notes

  • Used only for airborne phases of flight where aircraft control was lost.
  • Loss of control can occur during either Instrument Meteorological Conditions (Instrument Meteorological Conditions (IMC)) or Visual Meteorological Conditions (Visual Meteorological Conditions (VMC)).
  • The loss of control during flight may occur as a result of a deliberate maneuver (e.g., stall/spin practice)
  • Occurrences involving configuring the aircraft (e.g., flaps, slats, on-board systems, etc) are included as well as rotorcraft retreating blade stall
  • Stalls are considered loss of control and are included here.
  • Rotorcraft occurrences which involve power settling (vortex ring), or settling with power to ground contact are coded here and also as ARC if during normal landing or takeoff.
  • Rotorcraft External Load operations involving loss of control related to the external load should be coded as LOC-I as well as EXTL.
  • Includes Rotorcraft “Loss of Tail Rotor Effectiveness”.
  • Includes Loss of Control during practice or emergency autorotation.
  • Includes Pilot induced or assisted oscillations.
  • For icing-related events, which are also loss of control, code both LOC-I and ICE).
  • If the loss of control is a direct result of a system/component failure or malfunction (SCF), code the occurrence as an SCF-NP, or SCF-PP only. However, loss of control may follow less severe system/component failures, and in this case, code both categories.
  • Cockpit crew vision-related events and flight in degraded visual environments (for example, obscuration, black hole approach events, brownouts or whiteout events), where the aircraft is flown under control into terrain, water, or obstacles, are coded under CFIT, not LOC-I.